Ericsson GF 768 Troubleshooting Manual page 24

Troubleshooting guide
• If the voltage at H600 pad 4 is missing, measure the voltage at VRPAD (3.8V) at V706 pin 2 (class A, fig. 5.2.
• If the voltage is missing, check if VRPAD is at N452 pin 5 (fig. 5.3).
• If VRPAD is incorrect or missing, go to chapter 6.
• If the voltage at N452 pin 5 is correct, measure the resistance from it to V706 pin 2 (~0 ohms). If it's
too high there's a foil damage and the phone is to be discarded.
• If VRPAD at V706 pin 2 is correct, measure the resistance from VBATT to V706 pin 3 (~0 ohms, fig. 5.3
and 5.2).
• If it's too high there's probably a foil damage and the phone is to be discarded.
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Fig. 5.2
Fig. 5.3